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The starred or critical conditions in compressible flow refer to properties evaluated where

  • A.The Mach number is unity
  • B.The velocity is zero
  • C.The Mach number is at its maximum
  • D.The static pressure equals the ambient pressure

Answer: A

The starred quantities are the values the flow would have if it were brought isentropically to Mach one. They give a convenient fixed reference, and the ratio of local area to the critical area is what the isentropic tables use to relate a duct's geometry to the Mach number in it.

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